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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4aa9cdc1d83f40fefcda39d23ef734d858f802125460d6a36c3865d69944ea' 
  AND token = 'Ya7dA3i6a3bhCMUmFExP56WPl755wonES3z09ybPcb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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