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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7ed2efe70f7caa711ad7fed2f42022e3359528f30ab49b28fe892db96ff013' 
  AND token = 'Ccw/91O0FaWEpn92q0/XVnTuocXI1IWe7VuG64DwdT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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