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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337df470080f8891987cab71a9125121a0399186436126011071d3969578d0b2' 
  AND token = 'LNFZ538MfK1dCzj56x+6GKsJfYkhE8V1JCA1jAbNVGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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