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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214f0d786e55f501e00fa6395c5fd5e5c9b323a1e2f8b59b6634dfa6ca1763ba' 
  AND token = '8OVWawR5OaISirveZ10HbnIw/iMdjz7C3VgnCMcvS+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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