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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba628b36c4f0540bdaf7e5f8a397d2da902e1994e87615f1c4c98b7899c6c113' 
  AND token = 'ptCtkYqKwtu/gW8xcEX0dHx7NtD7aI3xlWyPKc2yM2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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