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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f886032b292cfc3ecb022d6fca753e09d5158244508c2f4c6c55c449471ebb00' 
  AND token = '5vY12uiNFKIkujZ5cyS+vLV4EfnG8bWj32kLtFnr84k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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