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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6452edccd3db2d0b44bc230912dec4024d34c1181ed19355b70012006796c02' 
  AND token = '+TwTIGGkAgVuInw3LPHep99kpAd6hBMwI6G9/HIzdlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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