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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ef10f56c1d9a962e903119423a0638c7f91893e0271ea573813b9dccbf57f8' 
  AND token = 'jopfzze19LGuz4qRAWDfLfu2d+l+xiPuBim4AFBU5oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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