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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8602f19afa2c13aa0e51de8797e835fd5a1f4c5e4d59c4f98ffea7d4673051' 
  AND token = 'd/VLcCL9AnPnBEBvEst2tjUm87QvVUus+tvyhzomf7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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