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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b5dd81d89fff311b3445a09c4eabc9a3061556ec9804882022ea381392080a' 
  AND token = 'T8jPzRkjhf0VC5RJoNL3MWXAgRk6rzrjoxYLo2bYstw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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