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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa0c3430a497d29074a522d92110c917480dcf9d4237e54ab4ed558141c0d9f' 
  AND token = 'aSkQk6YFO484dH/yrDkSvnws1aAA3ZiUKdr4Leb/eSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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