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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa596af43819a0d9694e45c385777b93361d6a87440cc448896ac27a0f735ef' 
  AND token = 'JPDU4vkaM0BMLxpxER6QCPWZRHY2dnRbvdezVijOIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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