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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4005e93f25c7e674f890921f5267bc9f4df61100256fda42e34799c0d506d6e' 
  AND token = 'TeSj/XRwU32wifSrh//0QG5b1VpGMHbjalrRiTlPzgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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