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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547943475c573a498701f196e933a5a21c565541cb7a2fa44c42281c51bf2068' 
  AND token = 'Jij2dCqyKrtRld/3ivYzP6l3dsE8X1utDNegR3eOPJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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