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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59785d3fe0a95b4cfdc7ed8fb277b5e435ee2f625d9a0dd802a86524dc038533' 
  AND token = 'TBN8BOB797TX+mSHIzEYdFHE09KOuLnIjULkmovr2wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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