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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c47bebf8eee612c1c6d92255df9100d48f74bce580339f336cee85ccd3c281' 
  AND token = 'IK7Q2S3bS2Eidk3ou7C4I6Ne6RutecHNEz/6m2c+8Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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