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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2e63b324e5132f6b8343c47943addf3d76222d1c5b71a255c1bcff6d0e7ca1' 
  AND token = 'xXsciwTpQlB8vroMsLilUbcdINH4HuBsuO4UZsa2V+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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