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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3798b8ae95e2afd43b7460cc450cc9c5b6b51cf182d04488a7d65fa840d9e0df' 
  AND token = 'v807KUhl+2ILssxFes0cM/52MNk9Lu+QpXbmOr2rTRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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