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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78734d5fe69875410c07e8af5810d524fc2cf80d6b88ae721ffe1e9236dc7c9b' 
  AND token = 'N/CvvLMyW4ZLhuFhSQMKv7DOmk1PQJc1K1AEMnb+fNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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