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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65cde6b22e5fd6a0f9edcc2b6ba303f5b19c684d0f42148ae3c06b3d910ffb6' 
  AND token = 'oUKl8925/t0bWeQ/d4tPixIshW+nk11GxWMf23XTJXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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