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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab1d93d6588003d4effe9f059ae0b362a4952997f1f5970542f5818c9a6609e' 
  AND token = 'iuGWdLV07/lx2Z+AdKl7DO+64A8RGDxx2QfhunamVeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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