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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f712c07c1bdb355c9c2839d3b591d5234c5c6c8e3c15c98e32def2cd63a66cdf' 
  AND token = 'jBsaFj2YVaRvZg1YmcgL3Fv8fdbraNG1Qgj689z7Kc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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