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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d085ed4f2c0f064d1d69086988abe1b434ecb3144dbb2706f7c0136c714952d' 
  AND token = 'lPTeqjDEI9eqkao14Xo00v6KNj2bpLD7n/pd7nlhpoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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