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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67ce29037b06f20a51d9da9fd06b9a93d862f5cab73fbcc6c3ba710d8a357bd' 
  AND token = 'UmINcnmQfwZ8NdMtYG1KxCy/KYvEfvMg1kM6iMaDLkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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