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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee33fd1fe8cbc8c7510bcf339a7bdf53f85491c2a38407bd8b9e6da6d57ffdc' 
  AND token = 'NJ2ao/n0Q4IXTEM/boGCu+PxcwjUcFaSdxZwEI4yfrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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