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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35427a115bfad8ca84d458a5e00eb85f91212c7ed8e31f9c1b976e490d9cf87a' 
  AND token = 'nvwvmG5WeByk1Mfr911Zp9xS0IQYnkDZXPq9gGIrtps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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