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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93ba723a2bf9bd4b4ede55a58624e094eff3bc1e4d5a44b87aa06a7ccc5b14c' 
  AND token = 't9BNy4yKJh+XfzQCe4tx06vNR5pgbpvyO1UFhfkKHq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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