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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99249e5482c66843a0a9ecc2a09557f2e14837ca96247ad1094f8f7285ec46d3' 
  AND token = 'kGG2+djkKDsacCrer1zzkoLIHReY4B65aA83tP7vj5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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