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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac197366407c1d3cacdc3ce9fbb0f9268187a102997c13f70256f328974be4b' 
  AND token = 'eO2709+MNphe+2NAW3SCsSMKtPg0l5tYERx/Se14scg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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