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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2055d049a8f6539ddba01d3bfb88a440b797f3a11fe48d9de5d0d0984a06265' 
  AND token = 'Ydns9Z2hxr6Frtf3gMYNa+JEw6qxf/P6UBmJWFh/M68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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