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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b268f44b0fc8231440c1f790a9d85208f41c381bcd9a93721053e087777e8e7e' 
  AND token = 'fAB5NzJZkVB8pKsi0XVDckIHa5Q01C1ud4NJ6Xmw/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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