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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931f118147f3463950e217d5fe0be386b64429b09891f8c72df6ff68163c7fed' 
  AND token = 'Dy48nvYliKrmBip7OQMG7xTPeA+4eg1RB9XhnxJ1DsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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