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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d1db32b5d3ca6ca5227ae31690c5df25b29eb5f80b398b943bccdfb37166a2' 
  AND token = 'IBVVedn03CpFqWAFkSELY2t1uNWEsxIkijOIzv7ViY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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