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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ee0c662a76809eb1d3d596e31f287acd7dc96709e8a75bed19f1b7a141d7ce' 
  AND token = 'aTDB5ghHznDR4wuAfwtix1cr07IS4H9bRT90f2xpod4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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