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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cfd58a78bb9878e721799ea490615f4723ecb256905398a61e63894ae37614' 
  AND token = 'I0NZFFd0m65tBowtFVlqgcvN1JmR+lYMEQAlP1XJEN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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