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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b287e490d95015e2fb7baeaad6c6dc5331cd4321c00616e05f5eb4e91b394c1' 
  AND token = 'fJjCOiB/+oDchcydLDYRqNmiLeA/o/JD0UnwivNTos8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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