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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1552226e54de9a9ea4351cfcfbd158f596f29912213a8f304af3e143575877b3' 
  AND token = '7GEeRCAk7LXblQFNass5Cuvh0lRNkB5Qz57LJ+IcWjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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