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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671f7f4db583aabe22b68ed595a6980bf41a4a0e2f5bfbc2f3e650eebd39cde0' 
  AND token = 'kmK4aeoCJttNSKxAuYl5kZCRaeLcG7XU7Gyq4VQao2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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