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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0ee17827547470062fc9a70ee9eee05a6e6f70c8531624c2366ade7f4e8ded' 
  AND token = 'mXmQj6tZ491q7DO8T70SSDsmWToQV1xPqpcswNWrXXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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