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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bb80b6088fbc24cd9048117a53f868936a4741a6a0c5f6d83a2d5245fc9399' 
  AND token = 'O/s7qral4grgdAWhrhRgH+Npbax5aNZfFww2NYbgGFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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