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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbce221486d11cc4c456f022aedd7629ce40894980fb091645e9e7db1b4450e' 
  AND token = 'OV65hI9zA0GTl3URwiOfG4d7lXAcNg/Z+yczxloFvAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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