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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2333f86023a46cbaac60581424d831df0d8b641806e3b107cd888732dbd4572' 
  AND token = 'E9+x+tvO/fsLyud6yhbhWBE2dINqPFWTHvGd9YGgdTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}