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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e458302e4947ad5a989d0b6657f8faa13210377b429fea77441355812ca16c' 
  AND token = 'aW5F/BA8c8vOEsG58r7Ev+MhADx3Msl7aUnPPZVd4fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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