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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0d11ce4d850e8c45afdb970baeff8101eb7532a4c9f59505db0fdec06edec7' 
  AND token = 'jGj2hez9xac7dZlDag+C5kCEB2hgZEe/aBxCxuAlzKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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