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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1362e1c46821a26d4333c3690f6dcac3ae61751b096fe0f681794b797a188fa9' 
  AND token = 'co0Gz1kZgubQBa+uRUZckq7IeU6a4f8fW5yJEI2IJHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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