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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4504104a3132d52d302a3e13f77fdccf6afe6dcfb28fb972bb082ffc0f55465' 
  AND token = 'qr+hTLRsZM8qlAQlYxfYX8ZHEVvPmOmmVSVO5A9EYUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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