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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0f572aeb264a001f9d940d6d00c99f69ec5064c7316d01b12dfa8a040e6f97' 
  AND token = 'Rgw7kLTa7m/cCTLWOMCUIwysWostUQV4AxB1dL5ds6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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