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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d0839da9fe1e15f9af6ef12f720952341a63f0aff70e4c39dabe9e6e11776e' 
  AND token = 'aNeusAp4IVKPcHjlOiTz8PMzHXPdGjcnef/hphl0v2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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