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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1151e91aa15bd906034e95718441c103a54bb342b842edb84e524b08d43af60' 
  AND token = 'raozVZ5Jxrp+Y80I2bAzSVDalVdxAK1r2D+M7iYVfZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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