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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83e63b6e8f016227f4d82cc09f9cdb49dc0d71154d164377cbb715bbf23185b' 
  AND token = 'Vo7exyy43yk+SffkyXAT2TvnWy2dICDmqHVXOADjpHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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